<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    /* 
      先请求A 再请求B 再请求C
    */
    function* getData(){
      console.log('A开始');
      yield setTimeout(()=>{
        console.log('A成功');
        gen.next()
      },2000)
      console.log('B开始');
      yield setTimeout(()=>{
        console.log('B成功');
        gen.next()
      },2000)
      console.log('C开始');
      yield setTimeout(()=>{
        console.log('C成功');
        gen.next()
      },2000)
    }
    const gen = getData()
    gen.next()
    // function* getData() {
    //   console.log("A开始");
    //   yield setTimeout(() => {
    //     console.log("A成功");
    //     gen.next();
    //   }, 2000);

    //   console.log("B开始");
    //   yield setTimeout(() => {
    //     console.log("B成功");
    //     gen.next();
    //   }, 2000);

    //   console.log("C开始");
    //   yield setTimeout(() => {
    //     console.log("C成功");
    //   }, 2000);
    // }

    // const gen = getData();
    // gen.next()
  </script>
</body>

</html>